That's merely for dramatic effect really. All the excitement is in zombies chasing and feasting on terrified humans. What these movies leave out are the finer more civilized aspects of zombies. You know, like zombies at the swimming pool, or playing catch with their zombie kids, or smoking a fine cigar with the other zombie guys. Sure maybe a zombie can't resist the temptation to just shamble around looking for the living upon whom to consume in good ol' fashion ghoulishly undead style, but I have to think that there are a few zombies here or there who really just like to sleep in a bit late on Saturday mornings and then enjoy a good breakfast of coffee, eggs, bacon, and some chilled human brains.